KR20010056501A - Private wireless local access network system for integrated communication service - Google Patents

Abstract

PURPOSE: A private wireless LAN comprehensive communication system is provided to implement a voice and data communication using one network without any limitation with respect to a mobility in a limited area. CONSTITUTION: A voice audio signal from a telephone network(207) is converted into a data packet based on a voice over Internet protocol(VoIP) in a voice/data integrated gateway(201) for transferring to an extension network. The converted data packet(IP packet) is transferred to a base station(203) of a cell in which a corresponding incoming terminal is installed by a mobility support router(202) based on the mobility support Internet protocol(202). A packet transfer between the base station(203) and the incoming terminal(204) is processed by a wireless interface. The data is transferred to the voice/data gateway(201) by the Internet router(206) on the Internet network(208) and is transferred to the base station(203) of the cell in which a corresponding incoming terminal is positioned by the mobility support router(202). The packet transfer between the base station(203) and the incoming terminal(204) is processed by the wireless interface.

Description

Private wireless near field communication system {PRIVATE WIRELESS LOCAL ACCESS NETWORK SYSTEM FOR INTEGRATED COMMUNICATION SERVICE}

The present invention relates to a private wireless near field communication system, and more particularly, to a private wireless near field communication system capable of wirelessly integrating indoor and outdoor voice communication services and data communication services in a premises or a restricted area.

Looking at the communication service providing structure in a conventional enterprise, factory, or school, there are many cases in which a local exchange for voice service and a local area network (LAN) for data communication are basically installed. Most voice communication in the premises is assigned a department or individual number. LANs based on the Internet Protocol (IP) are assigned IP addresses based on their location.

In the case of a relatively large area or a large workplace such as a school or a factory, if a worker's location is changed due to a change in department assignment, meeting or work, personal communication service for basic work is restricted. In other words, when the work phone is not connected and the location of the terminal such as a personal computer (PC) is changed, the IP address is reassigned and there is a problem that causes a lot of inconvenience during frequent movements such as resetting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a private wireless local area communication system capable of providing voice and data communication simultaneously in a single network free of movement in a limited area (premises). Its purpose is to.

1 is a block diagram of an embodiment of a private wireless local area communication system according to the present invention.

2 is a block diagram of another embodiment of a private wireless local area communication system according to the present invention;

3 is a diagram illustrating an embodiment of a protocol stack for an external network and a voice call service in a private wireless local area communication system according to the present invention.

4 is a diagram illustrating an embodiment of a protocol stack for an external network and a data communication service in a private wireless local area communication system according to the present invention.

5 is a diagram illustrating an embodiment of a protocol stack for voice call processing in a private wireless local area communication system according to the present invention.

6 is a detailed block diagram of an embodiment of a voice / data integration gateway according to the present invention;

7 is a diagram illustrating an embodiment for routing processing in a private wireless local area communication system according to the present invention;

8A and 8B illustrate an embodiment of handoff processing in a private wireless local area communication system according to the present invention;

* Explanation of symbols for the main parts of the drawings

201: Voice / Data Integration Gateway 202: Mobility Support Router

203: base station 204: terminal

205: Local Switch 206: Internet Router

207: telephone network 208: the Internet

According to an aspect of the present invention, there is provided a private wireless local area communication system, comprising: a wireless communication terminal for enabling a user to use voice communication or data communication in a limited area; Manage resources and users belonging to the communication system in the restricted area, perform mutual conversion between voice traffic and data traffic, control routing in the mobile communication environment, and process traffic in the communication system. An integrated gateway for; And converting the wireless traffic from the wireless communication terminal located in the cell area into wired traffic to the integrated gateway, converting the wired traffic from the integrated gateway into the wireless traffic, and transferring the wireless traffic to the wireless communication terminal. It characterized in that it comprises a base station.

The private wireless local area network architecture for providing a wireless multimedia communication service in a limited area according to the present invention integrates the functions of the existing private branch exchange and the local area network into a single IP-based network. As a structure for supporting wireless transmission of IP packets, a voice service is provided in the form of packet transmission over IP to provide a transport structure identical to that of a data packet to enable mobile access, and mobility for providing such a service. A protocol for transparently providing wireless mobile voice / data communication services in the premises, defining the structure of the voice / data integration gateway that manages the entire network such as management, radio resource management, address management, and provides interfaces with external networks. Define the structure and avoid delays and losses of packets during handoff and movement It defines the routing and hand-off techniques for delivery

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an embodiment of a private wireless local area communication system according to the present invention.

FIG. 1 shows a private wireless local area network that accommodates a voice service having a high speed Ethernet network as a backbone in an outdoor environment of a radius of about 1-2 km or a premises such as a building or a factory as a structure of a network according to the present invention. The network supports wireless mobile access and provides wireless voice / data connectivity to walking or stationary terminals. Provides voice service over IP by interworking with voice telephone networks such as Public Switched Telephone Network (PSTN), Digital Subscriber Line and Integrated Services Digital Network (ISDN). Functions as a wireless LAN with exchange and mobility support.

IP is not allocated centrally based on the fixed subnetwork, but can be allocated regardless of the physical location of the terminal as a management concept for the subscriber population of the network. It is possible to assign these IP addresses because it supports mobility in a limited area rather than globally. The voice / data integration gateway 101 manages all resources and subscribers of the network, performs interconversion between voice traffic and data traffic, controls routing in a mobile environment, and controls voice calls in the network. It performs on-premise exchange and global control over the network.

The fast Ethernet backbone 102 refers to a general wired LAN based on Ethernet of 100 megabit per sec (Mbps) or more that is currently commercially available. The subnets 103 and 104 are not a concept for subnetting or an IP address based routing in an existing LAN. Picocell 105 refers to a cell whose cell radius is reduced to provide a high speed air interface. The air interface in this cell should be able to provide user data rate (IP packet) of 25Mbps or more, and implemented through access method such as code division multiple access (CDMA) or time division multiple access (TDMA) in ISM band. The air interface including the cell will be described later.

2 is a configuration diagram of another embodiment of a private wireless local area communication system according to the present invention.

FIG. 2 illustrates the types of user services provided in the network of FIG. 1 and network elements for providing them. The voice call from the telephone network 207 is converted into a data packet by applying the Voice over Internet Protocol (VoIP) technology in the voice / data integration gateway 201 for delivery to the premises network. The converted data packet (IP packet) is forwarded by the mobility support router 202 to the base station 203 of the cell where the destination terminal is located in accordance with the mobility support Internet protocol 202. Packet delivery between the base station 203 and the destination terminal 204 is handled by a radio interface. Data forwarding with the Internet network 208 is forwarded by the Internet router 206 to the voice / data gateway 201 and forwarded by the mobility support router 202 to the base station 203 of the cell where the destination terminal is located. do. Packet delivery between the base station 203 and the destination terminal 204 is handled by a radio interface.

3 is a diagram illustrating an embodiment of a protocol stack for an external network and a voice call service in a private wireless local area communication system according to the present invention.

3 illustrates a protocol stack according to the voice service scenario of FIG. 2. The voice call from the external network is delivered to the voice / data integration gateway 301, and the call request message signal transmitted thereto is processed by the wireless voice switching protocol (WVXP), which is the highest protocol. This protocol analyzes the requested call to determine the destination address and to determine whether to establish a call connection to the destination terminal.

When the call setup is determined, the analog voice signal is changed into a digital signal at a higher level of the corresponding protocol, codec, and packed as a packet in the mobile session protocol (MSP).

MSP performs functions such as translation of originating / originating address of call, establishment, release, and management of service session, and performs segmentation and reassembly (SAR) function. MSP packets are delivered to the network by mobility-supported IP protocols through the User Data Protocol (UDP), which is suitable for real-time packet delivery. At this time, the physical layer network that delivers the IP packet is Ethernet.

The mobility support IP protocol forwards the packet to the appropriate mobility support router 302 using subscriber location information and routing table provided by the voice / data integration gateway 301. At this time, IP packet forwarding may be implemented by mobile IP or various tunneling methods.

The packet is forwarded by the mobility support router 302 to the base station 303 in the area where the terminating terminal is located. In the base station 303, the packet is transmitted through a real-time dedicated channel, and the terminal 304 having the destination address receives the packet. The received packet is delivered to the MSP layer through the UDP layer, the packet is disassembled and transmitted to the codec at the MSP layer, and the digital signal is converted into an analog signal at the codec and transmitted to the user by voice. Calls to the external network follow the reverse order above.

4 is a diagram illustrating an embodiment of a protocol stack for an external network and a data communication service in a private wireless local area communication system according to the present invention.

4 illustrates a protocol stack according to the internet service scenario of FIG. 2.

Packet exchange with the external network is performed by the voice / data integration gateway 401 serving as a router or gateway in the Internet. Transmission control protocol (TCP) packets transmitted transparently from the external network are converted into IP addresses in the MSP layer of the integrated gateway 401 and transmitted to the premises network.

Since the location of the terminal is not associated with the IP address, the mobility support router 402 uses the mobility-related information supported by the mobility support IP protocol (IP + m) and the integrated gateway 401 to place the destination terminal 404 in the packet. Transfer to the base station 403 of the cell. In the base station 403, the packet is broadcasted through a broadcast channel, and among terminals receiving the broadcast channel, the terminal 404 having the called address receives the packet. Since the terminal 404 is located within a user's working radius, the terminal 404 does not have a long time to operate with its own power source (battery) (about 5 hours). Therefore, the broadcast channel is always received, and the downlink data channel is a fully shared broadcast type. Like all wired LANs, it receives all packets and processes only those packets addressed to it. Packet forwarding to the external network follows the reverse order above.

5 is a diagram illustrating an embodiment of a protocol stack for voice call processing in a private wireless local area communication system according to the present invention.

5 shows a protocol stack for premises voice call processing. Wireless voice service based on IP is divided into external network access and premises service. In this case, all calls are handled by the voice / data integration gateway 504, which acts as an on-premises exchange because it does not go through an external exchange system. The voice / data integration gateway 504 performs call connection authorization, address translation, quality of service (QoS) control, and the like.

In the case of a voice call in the premises, a request for an outgoing call from the originating terminal 501 is transmitted through the MSP, and is transferred to the integrated gateway 504 that performs an exchange function for location confirmation and line occupancy request of the called terminal 507. do.

The integrated gateway 504 analyzes the call connection request and performs call authorization by performing a location check, a remaining radio resource check, a call availability check, and a QoS control of the called terminal 507. When the call is authorized, the call transfer request message is transmitted to the called terminal 507, and the call is initiated when the call acceptance is transmitted from the called terminal 507.

The voice call analog signal of the calling terminal 501 is converted into a digital signal through a codec, packetized at the MSP, and is integrated through the base station 502 and the mobility support router 503 through UDP, WCP, and IP layers. Forwarded to 504.

Packets forwarded to the aggregation gateway 504 are forwarded to the destination terminal 507 through the mobility support router 505 and the base station 506 according to the location of the destination terminal 507.

The wireless connection protocol (WCP) of the terminals 501 and 507 and the base stations 502 and 506 is responsible for establishing a connection in a wireless section.

The Wireless Voice Switching Protocol (WVXP) of the unified gateway 504 is responsible for processing voice call control signals in the premises.

6 is a detailed block diagram of an embodiment of a voice / data integration gateway according to the present invention.

6 is a configuration diagram of a voice / data integration gateway that performs core functions in an on-premises wireless communication network. The voice / data integration gateway according to the present invention is largely composed of four processing units. This is a voice signal preprocessor 601, an IP packet preprocessor 602, a connection controller 603, an IP transmitter 604, and the like.

The voice signal preprocessor 601 is responsible for processing a voice call request in an external network or a premises, and provides a connection function for converting an analog voice signal transmitted from an external network into a digital signal.

The voice signal preprocessing unit 601 includes a voice call processing control unit, a telephone network interworking unit, and a voice data signal processing unit.

The voice call processing controller is in charge of processing a voice call request in an external network or premises.

The telephone network interworking unit is in charge of interworking with voice telephone networks such as an external network, a public switched telephone network (PSTN), an asymmetric subscriber line (ADSL), and an integrated information communication network (ISDN).

The voice data signal processor performs a function of converting voice data received from an external network into a digital packet for VoIP.

The IP packet preprocessing unit 602 performs IP address translation for interworking with the external data network and the premises network.

The connection control unit 603 manages all control functions and subscriber service profiles related to the premises network and manages location related information.

The connection control unit 603 is composed of a location registration database, a user profile, a connection / line database, a service profile, etc. together with a call authorization control unit, a radio resource control unit, a mobility resource control unit, a location management control unit, an address management control unit, and an internal voice call processing control unit. .

The call authorization controller determines whether to grant the requested voice call, and performs a connection request to the called terminal, an acceptance process, and the like.

The radio resource controller performs radio resource management for voice communication with an internal or external network.

The mobility support controller is responsible for location tracking, routing information construction, handoff control, and the like regarding the movement of the terminal.

The address management controller is in charge of processing for IP / IP address management according to voice / data integration and location change in the premises network.

The premise voice call processing control unit is in charge of processing related to voice call establishment between terminals in the premise network. The voice call in the premises is implemented in a packet-switched manner rather than a circuit-switched manner implemented over IP, and processing is required because routing is required under a mobile station. The basic concept of routing consists of two steps. First, implicit delivery to the voice / data integration gateway and mobile routing from the voice / data integration gateway to the destination terminal. Mobile routing is realized by the function registration by the location registration information of the connection control unit 603 and the mobility / location management control unit and the like by the mobility support IP protocol.

The location registration database (DB) records the implicit original location of each terminal to which IP is assigned and the current location to which a packet is to be delivered.

The user profile records the terminal type, registration location, movement location, and call forwarding information for each IP, and the service profile records profiles for various basic and additional services such as internal communication and external communication.

The connection / line database (DB) records information such as an originating / originating address, QoS requirements, allocated radio resources, and talk time for various currently established connection and voice call lines. These databases are used for call control to support mobility and guarantee QoS.

The IP transmitter 604 actually transmits and receives IP packets to the internal network and the external network, and performs a dynamic routing function for mobility support. The IP transmitter 604 is composed of an IP packet converter, a traffic controller, a transmission controller, a reception controller, a control message processor, and a routing table.

The IP packet conversion unit handles dynamic IP conversion between the external network and the premises network, and functions related to mapping between phone numbers and IP addresses.

The traffic controller calculates the load on the entire network to perform traffic and flow control so that congestion or delay does not exceed a limited range.

The transmission control unit and the reception control unit perform scheduling and queuing to control packet forwarding from each connection to minimize delay at the gateway through a multi-processing scheme.

The control message processor processes transmission and reception of various control signals for controlling the premises network.

The routing table 605 dynamically constructs information collected by the connection controller 603 and routing information for each terminal according to a routing algorithm. All packets from the unified gateway are forwarded according to the information in this routing table.

7 is a diagram illustrating an embodiment for routing processing in a private wireless local area communication system according to the present invention.

7 illustrates a mobile routing concept for packet delivery to a mobile terminal in the present invention.

Routing in the premises network employs a dynamic rerouting scheme in which the unified gateway acts as an anchor. Since the unified gateway is a fixed point, routing from the originating terminal to the unified gateway consists of basic IP protocols.

Dynamic routing is applied to the routing from the integrated gateway to the mobile terminals 702, 703, and 704. Because the location of the terminal is variable and the location is not determined by the address, address translation by the user profile 705 and routing table 707 of the unified gateway 707 and the route calculation by the location tracking and mobility supporting router 708 Do this.

Voice calls from the terminal 701 of the telephone network are forwarded to the unified gateway 706, which acts as a branch exchange. The integrated gateway 706 performs a task for converting an analog circuit switched service into a packet voice service over IP. That is, address translation for routing, routing table creation, and IP packet creation are performed.

In address translation, the telephone number is first mapped to the corresponding IP address by the user profile 705. Routing is done by IP, but since the IP address does not represent a physical location, refer to the routing table 707, which calculates and stores a path based on the current location. The routing table is reconfigured each time the terminal moves. The routing path is calculated considering the shortest distance to the point and traffic load.

8A and 8B are diagrams illustrating an embodiment of handoff processing in a private wireless local area communication system according to the present invention.

8A and 8B illustrate a handoff scheme for mobility support in the present invention. Handoff introduces the concept of mobile clustering to solve packet loss and reordering in synchronous systems. Mobile clustering is a group of cells in which a terminal is currently registered and adjacent cells capable of handoff in the future into one routing group 805 and 806.

In the wired interval, the packet is transmitted to the entire routing group to which the terminal belongs, but only in the corresponding cell in the wireless interval. The handoff is requested by the terminal and the routing table and routing group change when the aggregation gateway authorizes the handoff. At the same time as the handoff, packet transmission in the wireless section is interrupted in the current cell 803 and simultaneously performed in the handed-off cell 804. This is a method for transferring the transmission state of a current cell to an adjacent cell since the delay for retransmission is increased when the cell is lost during handoff because the packet delivery order is not guaranteed due to the characteristics of the IP network.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

As described above, the present invention integrates a wired voice communication service network and a local area network into a low-cost wireless network in order to provide a wireless multimedia communication service in a limited area, thereby reducing the cost of establishing a communication infrastructure and providing a wired network service. By expanding the territory, there is an effect that can generate new revenue.

Claims (6)

In the private wireless near field communication system, A wireless communication terminal for allowing a user to use voice communication or data communication in a limited area; Manage resources and users belonging to the communication system in the restricted area, perform mutual conversion between voice traffic and data traffic, control routing in the mobile communication environment, and process traffic in the communication system. An integrated gateway for; And A plurality of base stations for converting the wireless traffic from the wireless communication terminal located in the cell area to the wired traffic to the integrated gateway, and converts the wired traffic from the integrated gateway to the wireless traffic to deliver to the wireless communication terminal Private wireless local area communication system comprising a. The method of claim 1, A mobility support router for forwarding traffic from the integrated gateway to a base station of a cell where the wireless communication terminal is located. Private wireless near-field communication system further comprising. The method according to claim 1 or 2, The integrated gateway, Voice signal processing means for processing a voice call request in a network outside the communication system or in the communication system and converting an analog voice signal transmitted from the external network into a digital voice signal; Packet preprocessing means for data communication for performing address translation for interworking data communication between the communication system external network and the communication system; Connection control management means for managing a control function of the communication system and managing a service profile for a user and location related information of the wireless communication terminal; And Data communication packet processing means for transmitting and receiving the data communication packet to a network inside the communication system and an outside of the communication system and processing dynamic routing for mobility support. Private wireless local area communication system comprising a. The method of claim 3, wherein The dynamic routing, Routing is performed by performing address translation and location tracking by a user profile and a routing table of the integrated gateway for delivering traffic from the integrated gateway to the wireless communication terminal, and by performing a route calculation by the mobility supporting router. Private wireless near field communication system. The method of claim 4, wherein The routing table, And a table for dynamically constructing the terminal-specific routing information according to the collected information and the routing algorithm of the connection control management means and delivering all packets from the integrated gateway according to the routing information. Comprehensive Communication System. The method of claim 3, wherein The wireless communication terminal, And a mobility support is performed through a routing group consisting of the cell in which the wireless communication terminal is registered and an adjacent cell capable of handoff of the wireless communication terminal.